Patents by Inventor Teruo Nuwa

Teruo Nuwa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Tube-hole structure for expanded tube-to-tube-sheet joint
    Patent number: 4142581
    Abstract: A tube-hole structure for an expanded tube-to-tube-sheet joint which is formed by axially moving a rod within each tube member in each tube hole of the tube sheet by external drive means, thereby imparting an elastic mass placed inside the tube with a sufficient compressive load to expand the tube uniformly in the radial direction to provide a rigid joint between the tube and tube hole, characterized in that each tube hole has at least one circumferential groove with an axial dimension or length of 1.5/.beta. to 3.0/.beta. (.beta. being ##EQU1## WHERE R is the mean radius of the tube member to be expanded, t is the wall thickness of the tube, and .nu. is the Poisson's ratio).
    Type: Grant
    Filed: March 30, 1977
    Date of Patent: March 6, 1979
    Assignee: Hitachi, Ltd.
    Inventors: Yuji Yoshitomi, Zensuke Tamura, Hideaki Kamohara, Keiji Omura, Yoshimasa Murakami, Tadasi Takata, Teruo Nuwa